The AN thread (also A-N) is a particular type of fitting used to connect flexible hoses and rigid metal tubing that carry fluid. It is a US military-derived specification that dates back to World War II and stems from a joint standard agreed upon by the Army Air Corps and Navy, hence AN. The Air Corps-Navy involvement is also the origin of the red/blue color combination that was traditionally used in the anodized finishing process.
The AN thread (also A-N) is a particular type of fitting used to connect flexible hoses and rigid metal tubing that carry fluid. It is a US military-derived specification that dates back to World War II and stems from a joint standard agreed upon by the Army Air Corps and Navy, hence AN. The Air Corps-Navy involvement is also the origin of the red/blue color combination that was traditionally used in the anodized finishing process.
Source: Wikipedia "AN thread" · CC BY-SA 4.0
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